3
3 Phase line to line voltages ► uC used to control switch states ► +E or 0 is shown to the load on each phase  Depends on if upper or lower switch is on

4
3 Phase line to line voltages ► 2/3 on switching scheme used ► Allowing switches to be off for 1/3 of the time reduces switching power losses ► Line to neutral voltages are not sinusoidal, but line to line are!!! *U, V, W are the desired line to neutral voltages

12
My epiphany + + ≈ One output port of uC looks like one switching stage Switches between 0 and Vcc Upper and Lower switches never on at same time (no shoot-thru) Using OCR1A:C of one Timer/Counter1 and the counters three output pins a three phase waveform can be generated **Bonus** I don’t have to buy anything to implement the design

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Setting TSM, asserts a reset signal to PSR0 and PSR321. Upon clearing TSM PSR0 and PSR321 are set to zero and timers/counters begin counting synchronously Other Considerations Make sure TCCR1 and TCCR3 are synchronous Using SFIOR Stop pre-scalers (stop the clocks) Set TCCR1 and TCCR3 to zero Restart prescalers